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Control Valve, Working Pressure 6000 PSI, Max Pressure 10000 PSI, Inlet 1/4 In (F)NPT, Outlet 1/8 In (F)NPT, Extension Type 6 In Steel, Features Boosts Line Pressures Built In Relief Valve for Releasing High Greasing Pressure Enabling Easy Disconnect of the Grease Coupler from the Zerk Fitting, For Use With Air Operated Grease Pumps, For Volume Greasing Applications On Shop Floor And Garages, Includes Pressure Relief Valve, 6 In Steel Extension Fitted with Coupler without Ball Check